using System;
using System.Drawing;
using System.Text.RegularExpressions;

namespace Rodunu.Movies.Web.Security
{
    public class Verification
    {
        public static string CreateRandomCode(int codeCount)
        {
            string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
            string[] allCharArray = allChar.Split(',');
            string randomCode = "";
            int temp = -1;

            Random rand = new Random();
            for (int i = 0; i < codeCount; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(36);
                if (temp != -1 && temp == t)
                {
                    return CreateRandomCode(codeCount);
                }
                temp = t;
                randomCode += allCharArray[t];
            }
            return randomCode;
        }

        public static byte[] CreateImage(string checkCode)
        {
            Bitmap image = new Bitmap(Convert.ToInt32(Math.Ceiling((decimal)(checkCode.Length * 16))), 22);
            Graphics g = Graphics.FromImage(image);

            try
            {

                Random random = new Random();
                g.Clear(Color.AliceBlue);

                for (int i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);

                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }

                Font font = new Font("Arial", 14, FontStyle.Regular);
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(checkCode, font, new SolidBrush(Color.Red), 2, 2);


                for (int i = 0; i < 100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);

                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }

                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);

                return ms.ToArray();
                //Response.ClearContent();
                //Response.ContentType = "image/Gif";
                //Response.BinaryWrite(ms.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }

        }

        public static bool VerifyEmail(string email)
        {
            string patternStrict = @"^(([^<>()[\]\\.,;:\s@\""]+"
              + @"(\.[^<>()[\]\\.,;:\s@\""]+)*)|(\"".+\""))@"
              + @"((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
              + @"\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+"
              + @"[a-zA-Z]{2,}))$";
            Regex reStrict = new Regex(patternStrict);

            return reStrict.IsMatch(email);
        }
    }
}
